腰椎不稳定的测量诊断常采用坐或立侧位腰椎片(不能用躺卧侧位投照,因可引起椎体的倾斜和旋转,产生椎体后移和椎间隙变窄的错觉)。必要时可加用后伸和前屈位腰椎片。照片必须包括腰骶关节。现将投照方法及测量介绍如下。1.腰椎侧立位 患者侧立在立位架前,双手抱头,身体尽量站直,右侧腰部紧贴胶片暗盒。暗盒上缘包括第十一胸椎,下 Lumbar instability measurement and diagnosis often use sitting or standing side of the lumbar disc (can not use the lateral position projection, because it can cause the tilt and rotation of the vertebral body, resulting in retroflexion and narrowing of the intervertebral space illusion). When necessary, can be added after extension and flexion lumbar disc. The photograph must include the lumbosacral joint. The projection method and measurement are introduced below. 1. Side of the standing position of the lumbar spine Standing in front of the stand, hands and head, the body try to stand straight, the right waist close to the film cassette. Upper edge of the cassette includes the eleventh thoracic vertebra, under